General grinder.



M. F. WILLIAMS. GENERAL GRINDER. APPucAnoN FILED MAY 9. 1914.

rrnn srn'rns r frana* FFME MILTON F. WILLIAMS, OF ST. LOUIS, MISSOURI,ASSIGNOR TO WILLIAMS -PATENT CRUSHER AND PULVERIZER COMPANY, OF ST.LOUIS, MISSOURI, A CORPORATION 0F MISSOURI.

To all whom it may concern.'

Be it known that I, MILTON F. WILLIAMS, a citizen of the United States,residing at the city of St. Louis, State of Missouri, have invented acertain new and useful Improvement in General Grinders, of which thefollowing is a full, clear, and exact description, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompany-l ing drawings, forming partof this specification` My invention relates broadly to mills 0rpulverizers of the rotary hammer type, and

lhas as its general object the provision of a.

durable and eilicient grinder adapted for usage such as the reduction ofgranular material, like grain, bones, fertilizer, etc., or fibrousmaterial, such as alfalfa, pea hay, corn stalks, etc.

More specifically, the invention relates to certain improvements inrotary hammer mills whereby certain parts of the mill areinterchangeable for` the purpose of adapting it to different uses, andalso whereby the capacity or reducing eiiiciency of the mill isincreased. A

Other and further objects of my invention will be obvious or hereinafterpointed out, reference being had to the accompanying drawings formingpart of thisspecification, in which- Figure l represents a sectionallelevation showing a mill arranged for the reduction of granularmaterial. p

Fig. 2 is a sectional elevation showing the mill arranged for thereduction of fibrous material.

Fig. 3 is a perspective of the granular breaker plate.

Fig. 4 is a perspective of the interchangeable cage section.

Fi 5 is a perspective of the breaker plate for brous material.

By reference to the drawings in detail, it will be understood that 1represents the machine casing, 2 a cover which may be suitably hingedthereto. Secured to the cover 2 is a throat casting 3 provided withseparate inlet openings for the purposes hereinafter to be described. 4is a rotary shaft carryirngthe hammer mounts 5, upon which are pivotedthe hammers 6.

In Fig. 1, 7 represents the grinding cage Specication of Letters Patent.Patented Mar, 12, 1918,

Application led May 9, 1914. Serial No. 837,445.

which may be of any desired sort, the same being suitably mounted on theframe 1, preferably by means of the side frames 8 which rest on properseats formed in the end walls -of the casing. A breaker plate 9 isadjustably mounted on the frame 1 in position to coperate with thehammers 6. Material is fed to the action of the mill from the hopper 10through the throat 11, the feed being controlled by a suitable valve 12.

The parts so far described are all well known in the art, and need notbe described further in detail. i

The machine as illustrated in Fig. 1 is suitable for the reduction ofsuch materials as can be fed into the grinding chamber from the hopper10. Such materials, of course, are limited to those which will feedfreely, -due to their form, size, or weight, such as grain, rock,commercial fertilizer, and similar materials, which for the purpose ofdesignation, I will arbitrarily term granular materials. Thisarrangement is not adapted, however, to the reduction of the sorts ofmaterials which I will arbitrarily designate fibrous materials,, such asalfalfa, pea hay, corn stalks, and similar more or less 'comparativelylight and bulky materials which are not adaptedr to feed to the actionof the beaters from the hopper 10. To accommodate the mill to both uses,a Very important consideration in mills of this sort which are designedfor sale to farmers who have a wide variety of uses for it, the mill isequipped with the substitite Y is disposed intermediate the breakerplate 9 and the cage 8, forming substantially a continuation of thelatter.. As illustrated, the removable cage section has the screen 16carried on the end frames 17, which rest in suitable seats on the sidew-alls ofthe casing 1, the cross frame 18 which is designed to contactwith the terminal cross frame of the cage 8, and the top plate 19 whichextends to the front wall of the casing and forms a. suitable supportingsurface for the mounting of the lbreaker plate 9. The removable cagesection may be inserted or removed by swinging back the cover on itshinge, whereby accessto the infor the reception of the so-called fibrousmaterials, the breaker plate 9 and its mounting are removed, thusleaving the front feed opening 20.` The removable cage section 15 isremoved, and in its `place is substituted the substitute breaker plate14. The substitute breaker plate is formed with the lateral supports 2llwhich are designed to rest in the same seats on the sidewalls of thecasing l 'which support the side frames 17 of the removable cagesection. On the lateral supports 21v is supported the impact plate 22,which, when in postion in the mill, extends from the forward edge `ofthe cage 7 to the front Wall of the casing 1, being 'u 20 is suitablysecured to the mill casing, and

forms a guideway or chute through vwhich the fibrous material may be fedthrough the front feed opening 20. A depending lip 23 is formed on thefeed-boardf24 in position 25 'to extend across the top of the feedopening 20, the same operating to prevent material belng thrown out ofthe feed opening 20 by the hammers.

'Ihe mill equipped as illustrated in Fig.

2, is adapted to reduce material which ordinarily will not feed withproper facility from the hopper 10, the arrangement providing a wideflaring feed opening through which the material readily passes'into thegrinding chamber. When so arranged, the feed hopper 10 is cut off fromthe grinding chamber by closure of the valve-.12,

In the reduction of most material, and vparticularly in the reduction oflight mate` 40 rials, such as grain, alfalfa hay, etc., there is acertain tendency of the material 'to race around `with the, beaters bothbefore it is reduced sufficiently fine to pass through the cageor screenand after it is suliiciently reduced, the whirling of the beaterstending to hold the material in suspension. In order to prevent thisracing ofthe Vmaterial and to facilitate the passage of the reduced`material through the screen, thereby increasing the capacity orgrinding eliciency of the mill, I provide the upper or bolting screen 25which is supported withinv the casing above the grinding cage 7 and'disposed on a radius greater than that of the cage 7 relative to theshaft 4. Disposed at suitable intervals on the bolting-screen 25,

' and extending thereacross between theside frames 26', I place thebaille plates 2,7, which project inwardly toward the shaft adjacent theorbital ath of the beaters. The effect of these ba e plates is toproduce eddies outside the orbit of thebeaters, in whichthe lightreduced material is carried beyond the rotary influence of the beatersand 'against 6.5; the bolting screen 25 through which it beaters, andmeans for exhausting the air passes out ofthe grinding chamber and'intothe discharge hopper 28. r

The discharge hopper 28 has outlet to a suitable suction fan. by way ofthe conduit 29, the arrangement being such as to provide a reducedpressure in the interior of the casing 1 which produces a suction fromthe interior of the grinding chamber through the cage' and screen. Theair is returned/from v the fan to the interior of the grinding chamberby way of the pipe 30, the arrangement tending to produce a pressurewithin the grinding chamber which` finds outlet through the foraminouscage andv screen. The baille plates 27 coperate in this ar rangement,vas above described, by enabling the reducedmaterial to free itself fromthe racing influence of the rotating beaters. Likewise the baflie plates27 provide places for lodgment of the unreduced material so as toprevent its being carried around ine'ectively by the beaters.

From the foregoing, it will be seen that my invention relates to certainimprovements in the structure of rotary hammer 9o mills whereby theadaptability of the mill is greatly increased, and its grinding capacityincreased.

I am aware that various changes and modifications in the formsillustrated and 95 lfrom the spirit and scope of my invention,

and therefore, it is not my intention that I be limitedV to the specificforms shown and described.

1What I claim is:

1. In a grinder, the combination of a casing, rotarybeaters, aforaminous cage within the/casing adapted to hold material to the actionof said'gfjlaters, said cage having its upper portion -oflset'relativeto its lower portion and spaced apart from the casing, a baiile plateextendlng'from said offset toward the operating orbit of the from thecasing about Ithe offset portion of the cage. a

2. In a grinder, rotary beaters, a perfo#l rate cage mounted forcop'eration therewith and having a portion offset from the beaters, abaflie plate mounted on the olfset portion of said perforate cage inposition to cop. erate with said beaters, and a casing inclosing thecage and spaced apart from the ofi'- set portion thereof.

. `3. In a grinder, the combination of a casing, rotary beaters,'a cagedisposed within thecasing for coperation with said beaters, the upperportion of said cage being foraminous and offset relative to the orbitof 126 the'beaters and spaced away from the casing, and baffle platesmounted within said offset portion and' having coperative relationshipwith said beaters.

4. In a grinder, the combination of a cas- 130 ing, a forminous'grinding cage mounted In testimony whereof I-hereunto aiiix my therein,a shaft carrying rotary beaters signature, in the presence of twoWitnesses, l v adapted lto coperate with said grinding this 24th dayoApri1,'1914=.

cage to reduce material, baiile plates mount- TON F. WILLS. 5 ed o nportions of said foramnous grinding Witnesses: i

cage adjacent the orbit of said beaters, and M. P. SMITH,

means for exhausting air from the casing. C. S. BUTLER.

